Amalia Koivisto Alho from Lake County is listed in the Minnesota Will Records. Nikolai and Amalia Koivisto can be found living in Two Harbors, Lake County Minnesota in the 1920 and 1940 census returns. A daughter, Ellen, is listed in 1920.
Ellen was not Amalia's child. I found Nikolai Koivisto in the communion records for Laihia, Finland. He married Serafia Nyland and they had Elli Lempi, born 3 December 1899. Nikolai immigrated in 1900. Elli immigrated in 1919.

I do have a Nukala line from Alahärmä/Purmo, if you are interested in sharing information.